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An industrial hygiene survey was conducted at A.C. Lawrence Tannery (SIC-3111) in South Paris, Main on April 11 and 13 and June 1, 1978 determined worker exposure to N-nitroso compounds. Approximately 240 workers were employed in the production area. The ventilation in the building consisted of a few fans mounted near the ceiling, an open door at one end of the building and an exhaust ventilating system at the other end. A total of 40 air samples were taken and 27 bulk samples of the tannery processing chemicals. Nitrosodimethylamine (62759) (NDMA) was found in all air samples taken inside the facility and ranged from nondetectable outside the facility to 47 micrograms per cubic meter (/Cum) at the retanning area. The average atmospheric NDMA concentration was 13 micrograms/cu m. Several samples also contained unreported concentrations of N-nitrosomorpholine (59892). One bulk sample contained NDMA at 500 parts per billion. When this chemical was in use, workers were exposed to approximately 52 milligrams of NDMA per day. At the time of the return visit on June 1, air samples contained 1.1 to 3.7 micrograms/cu m, about 10 percent of the earlier samples. The author recommends that this tannery be reexamined and other tanneries be surveyed to determine an industry profile.